package finder

import (
	"encoding/json"
	"io"

	"github.com/grafana/grafana/pkg/plugins"
	"github.com/grafana/grafana/pkg/services/org"
)

func ReadPluginJSON(reader io.Reader) (plugins.JSONData, error) {
	plugin := plugins.JSONData{}
	if err := json.NewDecoder(reader).Decode(&plugin); err != nil {
		return plugins.JSONData{}, err
	}

	if err := validatePluginJSON(plugin); err != nil {
		return plugins.JSONData{}, err
	}

	if plugin.ID == "grafana-piechart-panel" {
		plugin.Name = "Pie Chart (old)"
	}

	if len(plugin.Dependencies.Plugins) == 0 {
		plugin.Dependencies.Plugins = []plugins.Dependency{}
	}

	if plugin.Dependencies.GrafanaVersion == "" {
		plugin.Dependencies.GrafanaVersion = "*"
	}

	for _, include := range plugin.Includes {
		if include.Role == "" {
			include.Role = org.RoleViewer
		}
	}

	return plugin, nil
}

func validatePluginJSON(data plugins.JSONData) error {
	if data.ID == "" || !data.Type.IsValid() {
		return ErrInvalidPluginJSON
	}
	return nil
}